the problem with hide/unhide is that if the part is embedded in a subassebmly, when you want to unhide it, you have to find it in the model tree first.
if you change it to transparent so you can see what's happening underneath it, when you're done, you can still easily pick it on the screen and change it back to opaque.
like many things in CAD, there's more than one way to do something, just need to decide what the best one is at the time.